Sandpapering machine



March 4, 1930. H. A. LOVELAND SANDPAPERING MACHINE v Filed Jun- 1929 2Sheets-Sheet ATTORNEY WITNESS:

March 4, 1930. I LQVELAND 1,749,709

- SANDPAPERING MACHINE Filed Jan. 1929 2 Sheets-Sheet 2 rotary drivingmeans,

uses of such driving means and provide an Patented Mar. 4, 1930 UNITEDSTATES PATENT OFFICE SANDPAPERING MACHINE Application filed January 7,1929.

This invention relates to smoothing and polishing machines, an objectbeing to provide' a device which may be removably attached to a handdrill, flexible shaft, or other so as to increase the eflicientsmoothing and polishing machine at a small additional expense, which iscapable of use upon convex or concave surfaces, 'as well as upon planesurfaces.

nother object of the invention is the provision of an attachment of theabove character whose construction permits of the convenient removal andrenewal of the abrasive or polishing elements, so that a singleattachmenlt may be used for various characters of wor r.

Another object of the invention is the provision of novel means to mountthe abrading or polishing element and to yieldingly reinforce the sameso as to regulatethe degree of contact in accordance with' the work.

With the above and other objects in view, the invention further includesthe following novel features and details of construction, to behereinafter more fully described, illustrated in the accompanyingdrawings and pointed out in the appended claims.

In the drawings Figure 1 is an elevation illustrating the use of theinvention.

Figure 2 isa fragmentary plan view showing the abrading or polishingelement.

Figure 3 is an enlarged fragmentary sec- ;tional view takensubstantially on the line 3-3 of Figure 1.

1 Figure 4 is a fragmentary elevation showing the outerend of the. head.

Figure 5 is a similar view taken at rightangles to Figure 4. I

Figure 6 is a sectional view on the line 6-6 of Figure 7.

Figure 7 is a plan view of the removable locking ring.

Figure 8 is a detail perspective view of the outer end of the head.

Figure 9 is aperspective view of thelocking ring.

Figure 10 is a detail perspective view of the outer end-of the headlooking in a di- Serial No. 331,974.

rection opposite to that shown in Figure 8. Figure 11 is a sectionalview showing a modified form of the invention with the abrasive elementand yieldable reinforcing members removed.

Figure 12 is a fragmentary elevation of the outer end of a modified formof head..

Figure 13 is a similar view looking in a direction at rightangles tothat shown in Figure 12.

Figure 14 is an edge view of the locking ring shown in Figure 11.

Referring to the drawings in detail wherein like characters of referencedenote corresponding parts, the invention as shown comprises a head 15Whose outer end is provided with oppositely extending shoulders 16, theinner faces of which are'inclined as shown at 17.. These shoulders 16are further notched as shown at 18.

Removably mounted upon the outer end of the head and adapted to bearupon the inclined faces 17 of the shoulders 16 is a locking ring 19. Theouter face of this locking ring is flat so that it will be flush withthe outer end of the head when the parts are in position for use, asshown in Figure 3 of the drawings. The inner face of this ring is convexand its inner periphery is of a diameter to be freely movable upon thehead 15. Extending into the ring 19 are opposed inclined webs 20 whoseopposed edges are parallel as shown at 21. The space between theseparallel edges 21 is regulated so as to permit the ring to be slippedover the outer end of the head 15 with the flange 16 passing through thebore of the ring. The ring may then be given a' quarter turn so as tobring the inclined webs 20 in contact with the inclined faces of theshoulders 16, whereupon the outer face of the ring and the end of thehead 15 will be flush as previously explained. In order to preventaccidental rotation of the ring upon the head, the ring is provided withinwardly extending lugs 22 which are received within the notches 18provided in the shoulder 16 Mounted upon the head 15 are one or morelayers 23 of abrasive material such as sand paper, emery cloth, or othersmoothing or tral openings polishing material. The abrasive material 23is preferably formed of disks having cenfor receiving the head 15 andsurrounding these openings are concaved recesses 24 which receive thelocking ring 19. The depth of the concaved portions 24 is such that thedisks of abrasive material will extend beyond the end of the head andouter face of the locking ring so that the latter will not come incontact with the Work.

The abrasive disks 23 are backed up and yieldingly supported by disks 25formed of suitable flexible springy material, such as felt, paper,leather, rubber or cloth, but felt disks are preferably used. Thesedisks provide tension pads and one or more may be used to back up theabrasive disks so that when the invention is in use, the abrasive diskWill be yieldingly held in contact with the work. The number of disksemployed depends upon the character of the work performed. Where it isdesired to quickly remove a roughened surface preparatory to finishingthe same, a relatively coarse abrasive disk may be used and this diskmay be backed up with two, three, four or more tension pads. Where thesurface is -to be finely finished or polished, a fine type of abrasivedisk or polishing disk may be used backed up by a single tension pad. p

The disks 23 and pads 25 are clamped in position by means of acompression ring 26 whose outer diameter exceeds the diameterof thelocking ring 19 and whose inner face is concaved so that the workingface of the abrasive disk 23 will be forced and held out- ,ward beyondthe end of the head 15. Threadedly mounted upon the head 15 is acompression nut 27 which is provided with a corru-- gated-. :flange 28by means of which the nut maybe conveniently gripped and forced againstthe ICOIIIPI3SS1OI1 ring to hold the parts in proper position.

When it is desired to remove or replace an abrasive disk ortensio'n pad,the nut' 27 may -be rotated tov release. the compression ring,

' whereupon,

the locking ring 19 may be rofcated and removed from the head 15. Thegdisks 23 or'pads 25, or both, may then be reanoved. IThejdi'sks 23 arepreferably provided radially disposed slits 29 to facilitate shapingthem over :ring 19.

the convex face of the Where a number of abrasive disks are used upon apiece of Work, a number of disks may be clamped upon the head and whenone of .ithe disksis worn or useless, it may be torn "fromthe headwlthout requiring the removal 'iof the locking ring 19.

Any suitable means may be provided for rotating the device and for thispurpose, the head is provided with a shank 30 which is removably mountedwithina threaded bore 31v provided in the head This shank may have meansfor connection with a drill chuck or other rotating means and a numberof shanks may be supplied with the attachment so as to permit of its usewith various tools or devices. In Figure 1 of the drawings the inventionis shown in connection with a hand drill 31.

, If desired, the head may be hollow as shown at 15' in Figure 11 of thedrawings and the outer end of the head may be flared as indicated at 32to provide a beveled shoulder 33 which is similar to the beveledshoulder 16. This shoulder extends diametrically and is providedorprojections 35 provided upon a locking collar 36. This locking collar36 is attached to and removed from the head in the same manner as thatdescribed in connection with the form of the invention shown in Figure3.

The head 15' is provided with a compression ring 37 which is adapted tobear upon the tension pads and which is forced against the ads by meansof a compression nut 38.

T e invention is susceptible of various changes in its form, proportionsand minor details of construction and the right is herein reserved tomake such changes as properly fall within the scope of the appendedclaims.

with notches 34 which receive lugs Having described the inventionwhat'is engagement with the work, a locking ring removably mounted upon theouter end of the head for engagement by the disk, a com-' pression'ringmounted upon the head and bearing upon the tension pad to force the diskbeyond the outer face of-the locking ring, and means to force thecompression ring into position. L.

2. In a machine of the character described, a head, a flexible abrasivedisk of relatively large diameter mountedthereon and having its abrasivesurface disposedbeyond the transverse plane of the outer end of thehead, a tension pad mounted u on the head behind the disk to yieldinglyorce the latter into engagement with the work, a locking ring mountedthereon and having removably mounted upon the outer end of the head forengagement by the disk and having a concaved face bearing uponthetension pad with the outer edge of the compression ring disposed beyondthe'outer-periphery of the locking ring to force the Working-face'of theabrasive disk outward, and means to adjust the compression ring. p

In testimony whereof I aflix' my si ature.. -HAROLD LOVEL 7

